Can someone help me interpret this Martin Luther King quotation from Strength to Love?

Question

The ultimate measure of a man (or woman) is not where he (or she) stands in moments of comfort and convenience, but where he (or she) stands at times of challenge and controversy.”

Answer 1

It means that what determines who you really are is what you stand up for when it isn't convent, when you challenge and inspire others, or when everyone else is afraid to do the right thing.  Because you shouldn't just do the right thing when you have the time but rather always.

Answer 2

the true measure of a man is how he deals with trouble, turmoil, or conflicts